Next time you're stuck like that...
Pay attention to the letters you have left over. Sometimes I clear it and retype the whole quote, just looking at the strip at the bottom. Usually, there will be a letter that's only in there once, and you doubled it because it makes a real word (like brilliance and brilliancy).
You may want to check out the threads "coulda-woulda" and "obnoxiously difficult quotes" for examples.